Several effects can be added for one potion, but the more effects a potion has the less chance of success. And in case of failure, the potion will explode. Chances of success are calculated by the formulas: 0,4^X, where X is the number of potion effects before adding a new one.

This is an example recipe. You can use another reagent instead Blaze Powder. See the list of possible reagents on Potion Flask page.